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Abstract
A technique has been developed for the application of sodium alginate‐carrageenan coatings to PTFE membranes for protection against wet‐out when used for the membrane distillation or osmotic distillation of feeds containing surface‐active agents. The adhesive strength between the hydrophilic coating and the hydrophobic substrate was increased three‐fold using an interfacial‐bonding agent, myristyltrimethylammonium bromide. The coating afforded protection against wet‐out by sodium dodecylbenzene sulfonate, which is a widely used industrial detergent, and orange oil. It was also found to reduce membrane fouling by the fat globules present in whole milk. The coating technique described in this work may provide the basis for the development of a simple in situ membrane modification method for use with existing commercially available modules.